Lens-changing system

ABSTRACT

Remotely controllable apparatus in combination with a projector, for permitting projection of screen images from either optically uncompressed or anamorphic film images. An anamorphic optical device is pivotally secured to support means which in turn is pivotally secured to the projector and rigidly securable thereto for supporting the anamorphic device in a first position outside the projector&#39;&#39;s optical path and alternatively in a second position in the optical path. Controllably actuable transport means is provided for pivotally transporting the anamorphic device from the first to the second position upon a remote actuation and alternatively from the second to the first position upon another remote actuation.

United States Patent [72] Inventors John K.Taillon 3,249,007 /1966Staufier .1 352/140 X lSdierralhgagwre; P d M h C n FOREIGN PATENTS onian, asaena, t o. ai. I42 1 PP 838,39! 1,118,603 11/1961 Germany 1. 2/[22] Filed July 2, 1969 Primary Examiner- Donald 0. Woodie! PatentedJune 29, 1971 Attorney-David Weiss [73] Assignee Bell & Howell CompanyChicago, [11.

ABSTRACT: Remotely controllable apparatus in combination [54]LEN$CHANGING SYSTEM with a projector, for permitting projection ofscreen images '7 Claim 4 Drawing 85. from either optically uncompressedor anamorphic film images. An anamorphic optical device is pivotallysecured to [52] U.S. Cl. 352/140 support means which i mm is i u Securedto the projec l G039 3/00 tor and rigidly securable thereto forsupporting the Field of Search 352/140, anamorphic device i a fiposition outside the projectors 142; sis/44*; 350/255 optical path andalternatively in a second position in the optical path. Controllablyactuable transport means is provided [56] References cued for pivotallytransporting the anamorphic device from the first UNTED STATES PATENTSto the second position upon a remote actuation and alterna- 1,879,7379/1932 Del Riccio 350/255X tively from the second to the first positionupon another 2,797,618 7/1957 Bloomberg et al 352/ X remote actuation.

5 l 2- lo l l I l8 L s1 Support Moons PATENTEU JUN29 I97! SHEET 1 [IF 2W III'I John K. Toillon, Loniol D. Boen, INVENTORS.

2522 toansw ATTORNEY.

PAIENTEU JUNZS nan SHEET 2 BF 2 John K. Toillon, Loniol D. Boen,

INVENTORS.

ATTORNEY.

BACKGROUND OF THE INVENTION 1. Field of the Invention This inventionrelates to motion picture projectors, and more particularly to remotelycontrolled apparatus for modifying the optical system of a projector foralternative presentation of wide-screen and normal projection.

2. Description of the Prior Art The increasing trend toward automatedoperation of motion picture projector systems has made the display ofmotion pictures available to locations where this form of entertainmenthas previously been economically impractical. For example, motionpicture programming for the entertainment of passengers aboardcommercial aircraft has become an expected practice. The capability ofsuch projector systems to be operated" by a single person unskilled inprojector operation has, in addition, permitted substantial increases inprofits to owners of small theaters.

For these applications, projector systems utilizing 16 mm. film areeconomically utilized, since costly projector booths having specialpower, cooling and stringent fire prevention requirements which attendthe light sources demanded for projection of larger film sizes (35 mm.and larger) are eliminated. Moreover, the use of 16 mm. film permitsmore than 4 hours of continuous programming to be shown from a single30-inch diameter-reel containing over 9,000 feet of film. Such anextended period of projection continuity is desired for presenting acomplete program" in an uninterrupted manner with a single projectorsystem.

A program generally consists of a plurality of separate stories,"usually a combination of at least one feature-length and one or moreshort-subject motion pictures. Typically, the various stories comprisinga single program are not consistent in the type of optical systemrequired for their projection, since one or more stories may have beenprocessed for widescreen projection while the others in the program havebeen processed for normal projection.

One type of commonly practiced wide-screen process causes the printedimage on the film to be unnaturally compressed in the image horizontaldirection, so-that the optical system used during projection musthorizontally magnify the projected image to restore the image width toits natural or un compressed condition. The term anamorphic" is appliedto such systems, and the technique is commonly used to double the aspectratio (i.e., the ratio of width to height) of the image projected at thescreen with respect to the image printed on the film.

For example, a conventionally produced anamorphic print image has anaspect ratio of 1.33, while its screen image has an aspect ratio of2.67. When the print image is not unnaturally compressed, the printaspect ratio of 1.33 is unchanged at the screen. An anamorphic print ischaracterized in that the film image is optically compressed in at leastone dimension, requiring an anamorphic projection system to project anoptically uncompressed screen image therefrom, in contrast to a flatprint which is characterized in that the film image is opticallyuncompressed) (i.e., not optically compressed) and is suitable forprojection with a normal projection system.

In order to accommodate programs consisting of a combination ofanamorphic and flat stories, therefore, the projector optical systemmust, in addition to its projection function. apply an anamorphiccorrection when anamorphic stories are being presented and prevent ananamorphic correction when flat stories are being presented. In thepast, this has been accomplished by manually securing an anamorphic lensor prism system to the projection lens system (or prime lens"), foranamorphic projection; for normal projection, the anamorphic attachmentis manually unfastened from the prime lens and removed from the opticalpath. The manual operations which must be performed to effect lenschangeover are, of course, inconsistent with the desire to present acomplete program in an uninterrupted and automated manner.

One method of automating the lens changeover procedure, known to theprojector art, provides a motorized two-lens system turret arrangementwhich is remotely or automatically activated to place either an.anamorphically corrected projection lens system or a normal projectionlens system in the optical path.

This provision of two separate and independently used sets of lenses isexpensive, since a second prime lens is required as well asnecessitating the inclusion of separate focusing apparatus for each lensset. Further, the weight and bulk of the dual-optical systems, togetherwith their focusing apparatus, require provision for sufficiently largemotor drive means and adequate support structure. The conversion ofexisting normal projection equipment to accommodate anamorphicpresentation, using such a turret system, would ordinarily involveextensive and expensive modifications thereto.

SUMMARY OF THE INVENTION The present invention provides remotelycontrolled apparatus for permitting a motion picture projector system toproject optically uncompressed images on a screen from either opticallyuncompressed or anamorphic images on a film strip, without requiring theprovision of two separate and independently used sets of lenses. Ananamorphic optical device, such as an anamorphic lens, operates inoptical combination with the projectors prime lens, without physicalattachment between their respective housings.

The anamorphic device is automatically positionable in the projectorsoptical path and is automatically removed from the optical path, bothoperations being respectively actuated upon application of a remotelyoriginating command signal. For example, the command signal can begenerated in an automatic manner by the provision of suitable sensingmeans for sensing image type directly from the film strip, or by amanually controlled switching means (such as a pushbutton type switch)located at a remote control panel.

Focusing of the projected images can be adjusted by controllably movingthe prime lens along the optical path, for projection from either flator anamorphic prints. Accordingly, only one remotely controlled focusingapparatus is required, permitting relatively inexpensive conversion ofexisting normal projection equipment to accommodate anamorphicpresentation.

BRIEF DESCRIPTION OF THE DRAWINGS The novel features which are believedto be characteristic of the invention will be better understood from thefollowing description considered in connection with the accompanyingdrawings in which the invention and a preferred embodiment thereof areillustrated by way of example. It is expressly understood, however, thatthe drawings are for the purpose of illustration and description onlyand are not intended as a definition of the limits of the invention.

FIG. 1 is a part block, part circuit diagram of the invention shown incombination with normal projection apparatus;

FIG. 2 is a side elevation view ofa preferred embodiment of a lenschanging system in accordance with the present invention;

FIG. 3 is an elevation view of the preferred embodiment of FIG. 2, takenalong the line 3-3 in the direction of the appended arrows; and

FIG. 4 is a bottom view of the preferred embodiment of FIG. 2, shown inone position with respect to a projectors prime lens.

DETAILED DESCRIPTION OF THE INVENTION Turning first to FIG. 1, variousoptical components ofa conventional projector system for normalprojection include a projector lamp 10, a condenser lens system 12 and aprojector lens system indicated by a prime lens 14. Normal projection ofoptically uncompressed images printed on film l6 proceeds along anoptical path having an axis indicated by a broken line 18. Focusingmeans for moving the prime lens 14 along the optical axis 18 isprovided, indicated by a rack 20 and pinion 22 combination. Focusing ofthe prime lens 14 can be remotely controlled by suitable bidirectionaldrive means 23 for driving the pinion 22 upon actuation from a remotelylocated control panel.

An anamorphic optical device 24 is provided for optical combination withthe prime lens 14, and is coupled to a support means 26 for supportingthe device 24 while permitting movement between a first position outsidethe optical path to a second position in the optical path upon remotecommand. The first position of the anamorphic device 24 is indicated inFIG. I by the solid-line representation of the device 24, and the secondposition is indicated by representation of the device 24 in phantom.

The anamorphic device 24 is mechanically coupled to the output side of atransmission means 28, which restrains movement of the device 24 whenthe input side of the transmission means 28 is not driven. Thetransmissionmeans 28, however, causes the anamorphic device 24 to movetoward its second position when the-transmission input is driven in afirst rotational direction and toward its first position when driven ina second rotational direction opposite the first rotational direction.

The input side of the transmission means 28 can be driven by a DC motor30, which in turn is bidirectionally driven in accordance with thepolarity of a DC voltage applied across the terminals thereof throughsuitable circuit means 32. The circuit 32 includes position-responsivemeans 34 for causing the motor 30 to stop driving the transmission means28 when the anamorphic device 24 enters either of the fist or secondpositions.

For example, the circuit 32 can include a first limit switch 36 seriesconnected to a second limit switch 38, the switches 36, 38 beingsuitably positioned for actuation by the transmission means 28. Thelimit switches 36, 38 are respectively in closed configurations when theanamorphic device 24 is in neither the first nor the second position.The first limit switch 36 is caused to open, however, when theanamorphic device 24 is at its first position; similarly, the secondlimit switch 38 is caused to open when the anamorphic device 24 is at issecond position. I

Each of the limit switches 36, 38 is parallel-connected to respectiveblocking diodes 40, 42 oppositely poled with respect to one another.'Adouble-pole double-throw switch arrangement 44 is connected to a DCvoltage source 46 in such manner that the polarity of the excitation tothe motor 30 can be changed upon remote command; e.g., throughappropriate energization and deenergization of a relay solenoid 48.

When the circuit 32 is in the configuration shown in FIG. 1, junction 50is at ground or common potential'while junction 52 is connected to thepositive terminal of the DC source 46. The first diode 40 is thereforereverse biased and nonconducting, and since the first limit switch 36 isopen (the anamorphic device 24 being in its first position), the motor30 is inactive and the transmission means 28 therefore restrainsmovement of the device 24. The anamorphic device 24 is therefore fixedin its first position by combination of the restraints imposed thereonby the undriven transmission means 28 and the support means 26. I

In order to move the anamorphic device 24 from its first to its secondposition (in the optical path), the double-throw switches 44 areactuated (upon remote command) to reverse the voltages at the junctions50, 52. The resulting forward biasing of the first diode 40 permits themotor 30 to be energized and driven in a first rotational direction,causing the transmission means 28 to move the anamorphic device 24 offits limit position, closing the first limit switch 36. When theanamorphic device 24 reaches its second position, the second limitswitch 38 is actuated to open (while the second diode 42 is in areverse-biased or nonconducting condition), causing the motor 30 tostop. The anamorphic device 24 is maintained in its second position bythepreviously discussed combined restraints supplied by the undriventransmission means 28 and the support means 26.

When it is desired to move the anamorphic device 24 out of the opticalpath, the double-throw switches 42 are again actuated upon remotecommand, applying apositive voltage to the second junction 52 withrespect to the junction 50. Since the first limit switch 36 is in aclosed configuration, the second diode 42 is forward-biased andconducting, causing the motor 30 to be driven in the second rotationaldirection. The second limit switch 38 thereupon closes, since theanamorphic device 24 is moved off its limit. When the anamorphic device24 is driven to its second position (in the optical path), the firstlimit switch 36 is actuated to open; since the first diode 40 is reversebiased, the motor 30 is caused to stop. The anamorphic device 24 ismaintained in its second position by the combined restraints of theundriven transmission means 28 and the support means 26..

It should be noted that the anamorphic device 24, when positioned in theoptical path, is always at a predetermined distance from the plane ofthe film 16. Image focusing is accornplished by movement of the primelens 22 along the optical axis 18 while the anamorphic device 24 isstationary and at a location forward" of the prime lens 22; i.e., theprime lens is positioned between the film l6 and the anamorphic device24.

The preferred embodiment of apparatus according to the present inventionis best described upon simultaneous consideration of FIGS. 2, 3 and 4,wherein the same reference numerals are utilized to indicatecorrespondingly identical components. I

Turning to FIGS. 2, 3 and 4, the preferred embodiment 54 includes ananamorphic optical device such as an anamorphic lens system 56, rigidlycoupledto an output shaft 58 (FIG. 3) of a gear train 60 by means of adriving arm 62. The anamorphic lens 56 is shown in the first positionout of the optical path of the projector; the projector prime lens 64 isshown in FIG. 4, and the center of the optical path is indicated by itsoptical axis 66. The anamorphic lens 56 is shown in its second positionin the optical path in the phantom representation of FIG. 3.

The housing of the gear train 60 is rigidly mounted to a frame member 68which includes a mounting arm 70 provided with mounting brackets 72which are pivotably mounted to coaxial pins 75 retained by theprojector. The coaxial pins 74 can further support the housing of theprime lens 64 (as shown in FIG. 4).

A spring-type clip 76 is mounted to the projector, for releasablyretaining the housing of the gear train 60 such that the optical axis ofthe anamorphic lens 56 is maintained parallel to the projector opticalaxis 66. When the housing of the gear train 60 is released from the clip76, the apparatus 54 can be pivoted about the pins 74 when desired,providing ease of access to the projector.

The housing of a DC motor 78 is rigidly attached to the housing of thegear train 60, the motor shaft driving the input of the gear train 60 ineither of two rotational directions in accordance with the polarity ofthe driving voltage to the motor, as discussed above with respect toFIG. I. The circuit means 32 (shown in FIG. 1) is utilized with thepreferred mechanical ap paratus of thepresent invention, and theoperation of the preferred embodiment 54 will be described withreference thereto.

The operation of the preferred embodiment 54 is best described uponspecific consideration of FIG. 3. When the anamorphic lens 56 is in itsfirst position out of the projector optical path (as shown by thesolid-line representation), the driving arm 62 is in actuatingengagement with a first microswitch 36 which operatively corresponds tothe first limit switch 36 of FIG. I. When the circuit 32 responds to aremote command signal for reversing the polarity of the motor drivevoltage, the driving arm 62 is pivotally driven by the gear train outputshaft 58 until the driving arm actuates a second microswitch 38operatively corresponding to the second limit switch 38. The locationsof the microswitches 36, 38' are, or course, predetermined for requiringrespective actuation thereof during times when the anamorphic lens 56enters the corresponding first and second positions. In order to preventtheanamorphic lens 56 from overshooting the first and second positions,stop means such as appropriately positioned screws 80 are affixed to theframe member 68.

Movement of the anamorphic lens 56 from its second position (in theoptical path) to its first position proceeds in accordance with areversal of the above-described operation, and as discussed with respectto FIG. 1.

Focus drive apparatus can be mounted to the frame member 68, forcontrollably moving the housing containing the prime lens 64 along theoptical path, thereby controlling focus of the screen images. Forexample, a second DC motor 82 and gear train 84 combination can bemounted to the frame member 68 such that an output pinion gear 86 isbidirectionally driven in accordance with manipulation of a rockerswitch (not shown) situated at a remote control panel. The pinion gear86 is positioned to mesh with an input gear 88 provided by the-focusingapparatus of the prime lens 64, when the frame member 68 is rigidlysecured to the projector; the movable housing containing the prime lens64 is caused to move in response thereto.

ln order to assure that the prime lens 64 is not overdriven in itsforward direction (i.e., toward the anamorphic lens56) to extend intothe space occupied by the anamorphic lens 56 when in its secondposition, suitable position-responsive means 90 (FIG. I) can beprovided, for limiting forward movement of the prime lens 64 to aposition representing a predetermined minimum separation 6 between thehousings of the prime lens 64 and the anamorphic lens 56. For example,the focus drive means 23 (FIG. 1) can include a circuit similar to thecircuit 32 for driving the second DC motor 82. One of the limit switchesof such similar circuit, however, can be included by the positionresponsive means 90 and actuable to open when the axial distance betweenthe prime lens housing and the anamorphic lens housing equals thepredetermined minimum separation 8.

Thus, there has been described a preferred embodiment of lens changingapparatus for modifying a projector to permit projection of normalimages at a screen from either optically uncompressed or anamorphicimages on a film strip. Other embodiments of the present invention andmodifications of the embodiment herein presented may be developedwithout departing from the essential characteristics thereof.

Accordingly, the invention should be limited only by the scope of theclaims appended below.

What we claim is:

1. ln motion picture projector apparatus having an optical path, thecombination comprising:

an optical projection system in the optical path for projectingoptically uncompressed images on a screen from optically uncompressedimages on a film strip, said projection system including focusadjustment means for adjusting focus of said screen images;

an anamorphic device for optically modifying said optical projectionsystem to project optically uncompressed images on the screen fromanamorphic images on the film strip when said anamorphic device ispositioned in the optical path; and

remotely controlled means for pivotally positioning said anamorphicdevice in the optical path and alternatively for pivotally positioningsaid anamorphic device outside the optical path.

2. In combination with a projector having an optical path for projectionof screen images from optically uncompressed film images, apparatus formodifying the projector to pennit alternative projection of screenimages from anamorphic film images, comprising:

an anamorphic optical device;

support means pivotally secureable to the projector, said support meansadapted to be rigidly secured to the projector for supporting saiddevice in a first position outside the optical path and alternatively ina second position in the optical path; and

controllably actuable transport means, for transporting said device fromsaid first position to said second position upon an actuation andalternatively from said second position to said first position uponanother actuation.

3. The apparatus according to claim 2, above, wherein said transportmeans is actuated in response to an applied command signal.

4. The apparatus according to claim 3, above, further including remotelycontrolled means for generating said command signal and for applyingsaid command signal to said transport means for actuation thereof.

5. lncombination with a projector having an optical path for projectionof screen images from optically uncompressed film images, apparatus formodifying the projector to permit alternative projection of screenimages from anamorphic film images, comprising:

an anamorphic optical device;

support means pivotally secureable to the projector, said support meansadapted to be rigidly secured to the projector for-supporting saiddevice for movement between a first'position outside the optical pathand a second position in the optical path;

transmission means, for restraining movement of said device when notdriven, and for moving said device toward said second position whendriven in a first rotational direction and alternatively toward saidfirst position when driven in a second rotational direction oppositesaid first rotational direction; and

drive means responsive to an applied command signal for driving saidtransmission means in an alternate one of said directions, and includingposition-responsive means for causing said drive means to stop drivingsaid transmission means when said device enters either of saidpositions.

6. The apparatus according to claim 5, above, further including focusdrive means on said support means for cooperation with a projection lenssystem supplied by the projector, for driving said projection lenssystem along the optical path to adjust focus of the projected screenimages.

7. The apparatus according to claim 6, above, wherein the projectionlens system includes position-responsive means for cooperation with saidfocus drive means, for causing said focus drive means to stop drivingsaid projection lens system toward said anamorphic optical device whensaid system is at a position representing a predetermined minimumseparation between said system and said device.

8. In combination with a projector having an optical path for projectionof screen images from optically uncompressed film images, apparatus formodifying the projector to permit alternative projection of screenimages from anamorphic film images, comprising the combination of:

a frame member adapted to be rigidly secured to the projector;

motor means having a housing rigidly secured to said frame member, andan output shaft;

an anamorphic optical device;

an arm member rigidly securing said device to said output shaft forpivotal movement of said device upon rotation of said output shaft, formoving said device from a first position outside the optical path to asecond position in the optical path when said output shaft is driven torotate in a first direction, and alternatively to said first positionfrom said second position when said output shaft is rotationally drivenin a second direction opposite said first direction; and

circuit means connected to said motor means and responsive to an appliedcommand signal for driving said output shaft in an alternate one of saiddirections, and including position-responsive means for causing saidmotor means to stop driving said output shaft when said device enterseither of said positions.

9. The apparatus according to claim 8, above, wherein said output shafthas a longitudinal dimension parallel to the optical path and saidanamorphic device has an optical axis parallel to said optical path,when said frame member is rigidly secured to the projector.

10. The apparatus according to claim 8, above, wherein said motor meansincludes a direct-current motor connected to said circuit means, and agear train drivable by said direct-current motor and including saidoutput shaft.

11. The apparatus according to claim 8, above, wherein said frame memberincludes first securing means cooperative with the projector forpivotally mounting said frame to the projector, and second securingmeans cooperative with the projector for releasably constraining saidframe from movement with respect to the projector.

12. In a motion picture projector having an optical path, thecombination comprising:

projection means in the optical path for projecting images from a filmstrip, and including drivable means for adjusting focus of the projectedimages; a frame member secured to the projector; drive means secured tosaid frame member for controllably driving said drivable means whencoupled thereto; I

anamorphic means for horizontally magnifying said projected images whenpositioned in the optical path forward of said projector means;

motor means secured to said frame member and having an output shaft;

an arm member rigidly securing said anamorphic means to said outputshaft for pivotal movement of said anamorphic means upon rotation ofsaid output shaft, for moving said anamorphic means from a firstposition outside the optical path to a second position in the opticalpath forward of said projector means when said output shaft is driven torotate in a first position, and alternatively to said first positionfrom said second position when said output shaft is rotationally drivenin a second direction opposite said first direction; and

remotely controlled circuit means connected to said second motor meansfor driving said output shaft in an alternate one of said directions,and including position-responsive means for causing said second motormeans to stop driving said output shaft when said anamorphic meansenters either of said positions.

13. The combination according to claim 12, above, wherein saidprojection means includes a prime lens having a housing movable alongthe optical path by said drivable means, and said anamorphic meansincludes a housing rigidly secured to said arm member, the combinationfurther including position-responsive means cooperating with saiddrivable means and said drive means when coupled, for limiting forwardmovement of said prime lens housing to a position representing apredetermined minimum separation between said housings.

14. The combination according to claim 12, above, wherein said motormeans includes a direct-current motor connected to said circuit means,and a gear train drivable by said directcurrent motor and including saidoutput shaft.

15. The combination according to claim 12, above, wherein said outputshaft has a longitudinal dimension and said frame member is pivotallysecured to the projector and adapted to be rigidly secured to theprojector such that said output shaft is longitudinally parallel to theoptical path.

16. The combination according to claim 15, above, wherein saidanamorphic lens has a optical axis parallel to said optical path whensaid frame member is rigidly secured to the projector.

17. The combination according to claim 15, above, wherein said drivemeans is coupled to said drivable means when said frame member isrigidly secured to the projector.

1. In motion picture projector apparatus having an optical path, thecombination comprising: an optical projection system in the optical pathfor projecting optically uncompressed images on a screen from opticallyuncompressed images on a film strip, said projection system includingfocus adjustment means for adjusting focus of said screen images; ananamorphic device for optically modifying said optical projection systemto project optically uncompressed images on the screen from anamorphicimages on the film strip when said anamorphic device is positioned inthe optical path; and remotely controlled means for pivotallypositioning said anamorphic device in the optical path and alternativelyfor pivotally positioning said anamorphic device outside the opticalpath.
 2. In combination with a projector having an optical path forprojection of screen images from optically uncompressed film images,apparatus for modifying the projector to permit alternative projectionof screen images from anamorphic film images, comprising: an anamorphicoptical device; support means pivotally secureable to the projector,said support means adapted to be rigidly secured to the projector forsupporting said device in a first position outside the optical path andalternatively in a second position in the optical path; and controllablyactuable transport means, for transporting said device from said firstposition to said second position upon an actuation and alternativelyfrom said second position to said first position upon another actuation.3. The apparatus according to claim 2, above, wherein said transportmeans is actuated in response to an applied command signal.
 4. Theapparatus according to claim 3, above, further including remotelycontrolled means for generating said command signal and for applyingsaid command signal to said transport means for actuation thereof.
 5. Incombination with a projector having an optical path for projection ofscreen images from optically uncompressed film images, apparatus formodifying the projector to permit alternative projection of screenimages from anamorphic film images, comprising: an anamorphic opticaldevice; support means pivotally secureable to the projector, saidsupport means adapted to be rigidly secured to the projector forsupporting said device for movement between a first position outside theoptical path and a second position in the optical path; transmissionmeans, for restraining movement of said device when not driven, and formoving said device toward said second position when driven in a firstrotational direction and alternatively toward said first position whendriven in a second rotational direction opposite said first rotationaldirection; and drive means responsive to an applied command signal fordriving said transmission means in an alternate one of said directions,and including position-responsive means for causing said drive means tostop driving said transmission means when said device enters either ofsaid positions.
 6. The apparatus according to claim 5, above, furtherincluding focus drive means on said support means for cooperation with aprojection lens system supplied by the projector, for driving saidprojection lens system along the optical path to adjust focus of theprojected screen images.
 7. The apparatus according to claim 6, above,wherein the projection lens system includes position-responsive meansfor cooperation with said focus drive means, for causing said focusdrive means to stop driving said projection lens system toward saidanamorphic optical device when said system is at a position representinga predetermined minimum separation between said syStem and said device.8. In combination with a projector having an optical path for projectionof screen images from optically uncompressed film images, apparatus formodifying the projector to permit alternative projection of screenimages from anamorphic film images, comprising the combination of: aframe member adapted to be rigidly secured to the projector; motor meanshaving a housing rigidly secured to said frame member, and an outputshaft; an anamorphic optical device; an arm member rigidly securing saiddevice to said output shaft for pivotal movement of said device uponrotation of said output shaft, for moving said device from a firstposition outside the optical path to a second position in the opticalpath when said output shaft is driven to rotate in a first direction,and alternatively to said first position from said second position whensaid output shaft is rotationally driven in a second direction oppositesaid first direction; and circuit means connected to said motor meansand responsive to an applied command signal for driving said outputshaft in an alternate one of said directions, and includingposition-responsive means for causing said motor means to stop drivingsaid output shaft when said device enters either of said positions. 9.The apparatus according to claim 8, above, wherein said output shaft hasa longitudinal dimension parallel to the optical path and saidanamorphic device has an optical axis parallel to said optical path,when said frame member is rigidly secured to the projector.
 10. Theapparatus according to claim 8, above, wherein said motor means includesa direct-current motor connected to said circuit means, and a gear traindrivable by said direct-current motor and including said output shaft.11. The apparatus according to claim 8, above, wherein said frame memberincludes first securing means cooperative with the projector forpivotally mounting said frame to the projector, and second securingmeans cooperative with the projector for releasably constraining saidframe from movement with respect to the projector.
 12. In a motionpicture projector having an optical path, the combination comprising:projection means in the optical path for projecting images from a filmstrip, and including drivable means for adjusting focus of the projectedimages; a frame member secured to the projector; drive means secured tosaid frame member for controllably driving said drivable means whencoupled thereto; anamorphic means for horizontally magnifying saidprojected images when positioned in the optical path forward of saidprojector means; motor means secured to said frame member and having anoutput shaft; an arm member rigidly securing said anamorphic means tosaid output shaft for pivotal movement of said anamorphic means uponrotation of said output shaft, for moving said anamorphic means from afirst position outside the optical path to a second position in theoptical path forward of said projector means when said output shaft isdriven to rotate in a first position, and alternatively to said firstposition from said second position when said output shaft isrotationally driven in a second direction opposite said first direction;and remotely controlled circuit means connected to said second motormeans for driving said output shaft in an alternate one of saiddirections, and including position-responsive means for causing saidsecond motor means to stop driving said output shaft when saidanamorphic means enters either of said positions.
 13. The combinationaccording to claim 12, above, wherein said projection means includes aprime lens having a housing movable along the optical path by saiddrivable means, and said anamorphic means includes a housing rigidlysecured to said arm member, the combination further includingposition-responsive means cooperating with said drivable means and saiddrive means when coupled, for limiting forward movement oF said primelens housing to a position representing a predetermined minimumseparation between said housings.
 14. The combination according to claim12, above, wherein said motor means includes a direct-current motorconnected to said circuit means, and a gear train drivable by saiddirect-current motor and including said output shaft.
 15. Thecombination according to claim 12, above, wherein said output shaft hasa longitudinal dimension and said frame member is pivotally secured tothe projector and adapted to be rigidly secured to the projector suchthat said output shaft is longitudinally parallel to the optical path.16. The combination according to claim 15, above, wherein saidanamorphic lens has a optical axis parallel to said optical path whensaid frame member is rigidly secured to the projector.
 17. Thecombination according to claim 15, above, wherein said drive means iscoupled to said drivable means when said frame member is rigidly securedto the projector.